This is the wonderful October 1922 edition of Ulysses printed by Ezra Pound's Egoist Press in Dijon but published in London - the second edition, the first having been the Shakespeare and Company edition printed in Paris. The Egoist Press bought the plates from Shakespeare and Company to print this. A physical copy can be yours for something like $300 (not a bad deal, since of the 2,000 copies printed, 500 were burned by the troglodytes of the New York Post Office Authorities. But you can read it for free through the graces of the public-spirited uploader and the Internet Archive.
There is one problem with this online version, though - the first two or three pages of the novel are blank. Further pages may be blank too - it would be easy enough to check by skimming down through the thumbnail images on the PDF. Oh, doing so now, page 41 is also blank; 52 too but it's not clear if this is intentional; page 189 is missing, 566 and 568, but these may be intentionally blank… 633 is blank,
Could I request of the kindly uploader (may his or her shadow never grow less) that the first pages, with the opening scene of the novel at the Martello Tower in Sandycove, be re-scanned, and any others that are missing (hopefully the original images having been kept and not discarded when the PDF was made) added to the others to make a new, perfect PDF?
I haven't checked whether the other versions are sourced from the PDF and therefore are also missing the opening.
I'm giving this review 2 stars in regard to the missing pages, but hope it will be corrected and re-uploaded.